|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||Influence of Severe Plastic Deformation on the Local Deformation Behavior of Nanostructured Metals under Extreme Conditions
||Verena Maier-Kiener, Alexander Leitner, Reinhard Pippan, Daniel Kiener
|On-Site Speaker (Planned)
In this work, the thermally activated deformation behaviour of Au was studied by applying different nanoindentation testing techniques from room temperature up to 400 °C. While for single crystalline Au the indentation properties agree well with literature, the highly deformed nanocrystalline Au sample shows a surprisingly low modulus at temperatures exceeding 200 °C. In order to better understand this phenomenon, different other fcc- and bcc-materials produced by both, bulk as well as powder HPT-fabrication, were additionally tested up to 400 °C. It is shown that for all materials the modulus of the powder-deformed samples exhibits a pronounced reduction at higher temperatures, while for the bulk derived nc-states the modulus behaves according to literature. This novel phenomenon is discussed in the context of a higher concentration of vacancies at the grain boundaries, additional creep effects, or changes in the sink-in formation due to different work hardening behaviours.
||Planned: Supplemental Proceedings volume